剑指offer——面试题11：快速排序

 #include"iostream"
 #include"random"
 using namespace std;

 /*
 void Swap(int &a,int &b)
 {
     int tmp;
     tmp=a;
     a=b;
     b=tmp;
 }
 */
 //官方给的partition函数
 int Partition1(int *data,int start,int end)
 {
     int index=start+(rand()%(end-start+));
     swap(data[index],data[end]);
     int small=start-;
     for(index=start;index<end;index++)
     {
         if(data[index]<data[end])
         {
             small++;
             if(index!=small)
                 swap(data[index],data[small]);
         }
     }
     small++;
     swap(data[small],data[end]);
     return small;
 }

 //自定义Partition函数
 int Partition2(int *data,int start,int end)
 {
     int value=data[start];
     while(start<end)
     {
         while(start<end)
         {
             if(data[end]>value)
                 end--;
             else
                 break;
         }
         if(start<end)
             data[start++]=data[end];
         while(start<end)
         {
             if(data[start]<=value)
                 start++;
             else
                 break;
         }
         if(start<end)
             data[end--]=data[start];
     }
     data[start]=value;
     return start;
 }

 void QuickSort1(int *data,int start,int end)
 {
     if(start==end) return;

     int mid=Partition1(data,start,end);
     if(mid>start)
         QuickSort1(data,start,mid-);
     if(mid<end)
         QuickSort1(data,mid+,end);
 }

 void QuickSort2(int *data,int start,int end)
 {
     if(start==end) return;

     int mid=Partition2(data,start,end);
     if(mid>start)
         QuickSort2(data,start,mid-);
     if(mid<end)
         QuickSort2(data,mid+,end);
 }

QuickSort.h

 #include"QuickSort.h"

 void Test1()
 {
     int data[]={,,,,,,,,,};
     cout<<"use QuickSort1:";
     QuickSort1(data,,);
     for(int i=;i<;i++)
         cout<<data[i]<<" ";
     cout<<endl;
 }

 void Test2()
 {
     int data[]={,,,,,,,,,};
     cout<<"use QuickSort2:";
     QuickSort2(data,,);
     for(int i=;i<;i++)
         cout<<data[i]<<" ";
     cout<<endl;
 }
 int main()
 {
     Test1();
     Test2();
 }

TestQuickSort.cpp